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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe26c5101ec74fbcff246ff08992f83ef5673c6784db00f663b6b1e3fb0fae4' 
  AND token = 'DdhlJCMYjbkC57lU57Lw4pQtKVdltdp8vkPf+9ZCB84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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