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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8146fc1b95a25e05cf6a386fa876da9f5c0755a92379bf12e1775d137804c314' 
  AND token = 'cOtUb1rlYsU/q5POlNgPLCW8u/MuwU0DG08jcxn4Rlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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