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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a997929a67911516e53f79dba2c200f07cb410998b161e270d5f831ff038e3e8' 
  AND token = 'b21gmb/chl13+VdVBNx3oO72q5NDgSIFInJlBLkFDvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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