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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70de36a45c1b012f2bcaaf9c8ff9c8dd8049b506e91a2ae9ac78c98ecb5e7e75' 
  AND token = 'kYef8b2DZaUfdDNVsRTL48rODEJeF7DelAOJSr4RI4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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