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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c47eac659dad7a851284ca23bc2eabf3ce3317cd6c838a2bb9480e549c7604f' 
  AND token = 'bfr0P0soPar4uvDOIutYFN7R267eLd5s4OXrFV+LUMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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