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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d55293ca5e7a4b82d22d63a412b521087854ec8db58778003010c1913feda34' 
  AND token = '8MTzgknZJVZiwY4eDcEs77pivLyYUWIc+75y5wXCaBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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