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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c3ff2e11b4feb04c830277456ba7c2a4d3c4750e68572db7ef8a37df50fb1b' 
  AND token = '/xCUedKCqSBa5voAQU2AxOx7JinAOAO9F+8foegmIB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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