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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a1471f068fda8916b55743bd493966fc75a7acc561d7cdfb50590915091224' 
  AND token = 'oOsBndC/Sa3DkmrcnG6CxvGdT3N2sQ0jlffUc1RQPwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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