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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5919f58bf1ee8ff863c3a52996e1a62859ddd23ae2ea4b96fae524c6a3a89ea2' 
  AND token = 'tvQE0xphDH9V4BxfR89U1OhOdSCQ5jxyJTG33J0TE+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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