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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108628729071cf2633b4c33348717b62f4d516efdd2d4b15d25baeb31cf3ebd6' 
  AND token = '6tjwJED0BiMTDDZFyHq7wr9V37eqWt4/Mca7g6HsdM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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