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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25111588c01a53ccacefcf94a45a8972daf60bbf60c6241c8749bcb584587416' 
  AND token = 'f/dyzFCIDQig7Rz0Rj+nujHILcKmUH85m3DElfLpaEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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