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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8bb0cdaf23170b8ad9f3f67ec57970ec1946165b8a8c80d95b965b810e06af' 
  AND token = 'Oo+i350FOAiiZ64x61mzmxiD4dLKEAIiGwaWz83zR4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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