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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1260d3bd62f70c8500dc2a49b656732c2b936fb30f646fa0e58d3aa7b1153c0e' 
  AND token = 'xjcMJA0tX1I6qr2vUdFDR2Lec971yykJIZbSH0JqbmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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