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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d8800c4ef5025f09c835f78d5fd64c0b827a41752b9a6e9ff6cfca08a0618b' 
  AND token = 'ojrhaCcevaN1MNUayhzdLGkK45WbR09Ny9j4XKJHg7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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