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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9293616c94dfae016ebed787d4849b3d8813143cfe0515bae8fc641ec13856ac' 
  AND token = 'vcP0f0UvIKW8GMwp54o7+UfGJSLF4ZOfnyblU7GmgVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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