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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ec475b38c045ecef7108b189be038286e0c42849bb5375e389f5de5e74b4dd' 
  AND token = 'PxpIEt7VdHvq3G4Nipx96uo7wN2rOdTnWnEStUFwL/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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