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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7c8bed93c52850c31914046fcf498df9f311264bee186880e3ba0d155d911c' 
  AND token = '92UfwMrzsHCXkhCLUXffxd9MfH5zfINY70BeFQ7fMaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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