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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2e9af732f3aed5e75537dad0340a6e45e6ccadbb053493fbbe422fd4e1d8c7' 
  AND token = 'k7AZC8NzhBy8H9+i4Eupdz9swVVOBrnBDdSLjhr+ha4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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