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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ece8c983d0b860e75d810d68bba83dc62e226a1b1739cfd766648c38dd2419' 
  AND token = '5WQABzkyfuqmbCPsX3DOmLbT+zrQ9v1Lr81q1kJuQIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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