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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d2656f20fab3d82e4dc18e07945ad037a0d3c515d07b0bfffed50a8cc7cf4e' 
  AND token = 'QTv1DR5qL5WgMlF2358R0rWEO6ymK+COlFYyzQYDMMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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