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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53890536addfaae6cfc3a5f3e96e4a41a56ae9dc2f09bd1ddc854f58741f9178' 
  AND token = 'RbL51PoqQiyX14YHYFdmnzw1AE9k69lo4r0pzJ+nu5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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