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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa484f034e3f4f3474505b5e888d308ef5e2a5d45ccafcd16bf74917a2464637' 
  AND token = 'nprLbLHjb/hZUM4fcW5UV7BfOPFWfH3ithWqlyzMPlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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