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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf1c085fba5f85461d2f113bcdb58a052499c349f6a2bc4834545431aec8290' 
  AND token = '7yCwcn7fyDXJjH7abtsNmrqpNZ6ipl2azn9vC7y8Bkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}