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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55a2d57a7a3f91f0cd85610c15e22a38b6758ebbc1d86b3384673e83980532f' 
  AND token = 't2R4rfQSd1065/IqRrUkCDMrubhSVrdMw1kQJQSj+Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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