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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d0a3fd01dda678fbe4226479d0b56eade589ea7368062541f693d0417591f5' 
  AND token = '/WPup7/TKM+UjywJgf+rybQd3FcguF/Sbcl47CNIfSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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