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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ccab675b7aa7ef2459164984f26f7fd8f1f6282783b3f67b0b0483ace677ec' 
  AND token = 'NtxxE8HL7+ZKdw39p+XpUCu5SF+anHaV1hWdIsquszE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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