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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c986686f3d75c88beccbc0c1072ef6c1a32d2bc80ca9128c5c1ef80aa020c8' 
  AND token = 'f3FIY07Ua6J11+6kNriUsM1P5hLCG9/KN2Jz9ItUu7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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