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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632e4f7799db77015a230b78f08fbd3703a282c2e617ae8d04dd1629505c2d95' 
  AND token = 'FQrh3mYL8ep2xebWK4O7sk886SIWNyBjHJi/wKSGlmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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