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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515410da4fc0a3feacc84ce90d488248b37f44103f861a3704c8a86dff1f2e1a' 
  AND token = '57PDkyKaCX1w3YjfklFaD6mVNBIKIC04WnqJDX+CTmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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