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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86bbfd12b42495290f086fe1601e481968c6c5ea0150efbc1982a1e32e3221f' 
  AND token = 'lXQu1Zf8dy39lkH1TSoJ1RMWn6ab5jaq6r8nCiTEWYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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