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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ccd468f063dd33844558bc6ddadde4ebaeea6dd1c73dec9bf8d8bd715f9586' 
  AND token = '4WJfcV3fZSaiLcLDr043Y70N/oxXZgMicnuAU5aFTUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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