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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2125c3e64f1fcc4c3ee19592e1b3840e6b364cc2f992b9b81b6dffa6d29755fd' 
  AND token = 'eVMkA3HO2MwsROUtd/Q5Ur/4tiWgc/0VQm8WAn2wm2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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