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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da179365e6d03402fbf2deaae95e03631a475fab177932ef6b577db7f5038666' 
  AND token = 'T/vvvQytH11fzbatBlv7ifHNW3IafBOIaG/ixP+ZSGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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