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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d14c053a4d2bb4cc2a40cf4dd3e64da6fdce6a962ac89dacd2d0233d2d5cd3' 
  AND token = '+gAxaN3pI2frgWci3ULe/p3ULLvrdLwa/N6kry/JiFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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