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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0631bb3aad3dd483b6bd12e47feec51d2762e1ba33cfb1901fe4cd50ceb38c6' 
  AND token = 'NWnwbj3R5zkjkl5utc5UQjCYmt1hhSEfr1Bl6Z1w80I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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