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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d15636e9a37f549ca4f26312c9c68a685c45e0af31cdaf6b4f407d21ce5b91' 
  AND token = 'VtI79c3zFP+IT8m3P4Jys65wyxtHfxIeJtxIgFLjQLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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