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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a52607462f2b30c1a98ba517780985af973bd10380d3bfac235519ae9830f49' 
  AND token = 'xSWZJHInouo5KyeK80IxHnaq/NrPGM9K1CGzoaZwFwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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