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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0e77cadaa7212764a2d2b3b22c782f91a0f4a66ac23c4618f219bc0d223724' 
  AND token = 'lfotdPI+vpBlBUn/W6/ca+6d3jE8cL+gtojGnHiozoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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