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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b00b08741c320ae550b1add9bf310e232a918f1b1005200fa087231879c250' 
  AND token = 'os+zDgPOPHaQxL07B3Lufl3Fr0uAxtNdjSNdrgxFCo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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