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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68438bd09fff1581cf8f5907aafc4d693345b70e9ccfc85d2c8d457444e0b7ed' 
  AND token = 'THW7cl0XC2CEVM51uEa9srkLVhd161kRBKqAGsXwJIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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