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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31e35b2fc7ed6de58754e389c009727fb9e51db0b5bc0e1cbbd7191e67a72d8' 
  AND token = 'BSwPl/JpjJWNp5Uia7PEmCHNVS/LqD52yJ32Qwy30Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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