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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e442f72c950f8996c0f6128b2fd4837b0238e7f06f0df13ec74242e14c386ed4' 
  AND token = 'EFd3pOuihOnINk4lSFaf9pZCSdNLZN8VZAENHOu5qa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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