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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4285b0763efc54f3ef01aa4e7567794ae4ffdb3849a41161f342cc0bd912874e' 
  AND token = 'F9zz31krgoP7X335XR2TEUSnZZ4Wat7lJU4KmnfIRfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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