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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab2699d1ae14605327158a771e1d2982f4326f2702bfb7da824fa14b69b3f44' 
  AND token = 'ttyKIfd5vZ78DAxt0Va7i2M+iH2/52XP65yJTMOqVGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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