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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07055fae06ada007767dc10a0fae765bf100b7a997627cbdc2bd7bf762d2e49' 
  AND token = '2L+vkNpAdzW/D5Sre5dmcPKr7REjwWnu+5i/yP9PACI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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