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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df6560ebd1ac590fd27f421936bc5b2c1a4b3f870bc8b9f3620b679e57442d3' 
  AND token = '8iGctyQuFqizSRLO8CV7lWnPePOTFRRQde0zci73A+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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